Exchange backups and SCR

I have an Exchange 2007 mailbox server cluster - Active/Passive. It has an SCR target for all SG's in another site. We run full backups on this server on Friday, and incrementals other nights. Two questions on this.

1. Can anyone tell me - does the copy status of the logs to the SCR target have any bearing on the commited logs being flushed after a backup? I ask this as otherwise, I could see a problem...

For instance, a full backup is running but there are network issues to the SCR target and the copy queue length on the source builds. The full backup completes and then the logs are getting purged. Could this mean some logs are purged before they have a chance to be copied to the target?

2. The copy queue length is on the source server?

3. The replay queue length is on the target server and is the number of uncommited logs. Once a full or incremental backup runs on the source, the replay queue length is cleared too?

4. Can a high copy queue length ever prevent the logs from purging on the source? after a full/incremental backup?

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